Exfo FTB-7000 OTDR for FTB-200 v2 Uživatelský manuál stáhnout pdf (Strana 189)

100

101

Analyzing the Results Manually

OTDR 175

Getting Optical Return Loss (ORL)

Note: You must use a singlemode OTDR for ORL calculations.

The ORL calculation will provide the following information:

³ the ORL between markers A and B

³ the total ORL is calculated either between the span start and the span

end, or on the total fiber span, depending on the option you have

selected in the Setup window.

Optical return loss (ORL) refers to the total effect of multiple reflections

and scattering events within a fiber-optic system.

Note: If you are testing in Real time, the reflectance value you will get is not

necessarily accurate.

To get the ORL value:

1. From the main window, select the Measure tab.

2. In the Results section, press ORL. Markers A and B appear on the

graph.

3. Position markers A and B to delimit the area for which you want to

know the ORL value.

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Exfo FTB-7000 OTDR for FTB-200 v2 Uživatelský manuál Strana 189

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